IS 1879: Malleable cast iron pipe fittings _ Specification

2010·1.8 MB·English

by  Bureau of Indian Standards

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IS 1879 (2010): Malleable cast iron pipe fittings _
Specification [MTD 6: Pig iron and Cast Iron]
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IS 1879: 2010
Hkkjrh; ekud
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—
(rhljk iqujh{k.k )
Indian Standard
MALLEABLE CAST IRON PIPE FITTINGS —
SPECIFICATION
( Third Revision )
ICS 23.040.10; 23.040.40
© BIS 2010
B U R E A U O F I N D I A N S T A N D A R D S
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002
March 2010 Price Group 10
Pig Iron and Cast Iron Sectional Committee, MTD 6
FOREWORD
This Indian Standard (Third Revision) was adopted by the Bureau of Indian Standards, after the draft finalized by
the Pig Iron and Cast Iron Sectional Committee had been approved by the Metallurgical Engineering Division
Council.
This standard was first published in 1961 and subsequently revised in 1975 and 1987. While reviewing the
standard in the light of the experience gained during these years the Committee decided that the standard may be
further revised.
In this standard all amendments issued earlier have been incorporated.
For the purpose of deciding whether a particular requirement of this standard is complied with, the final value,
observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS2:1960
‘Rules for rounding off numerical values (revised)’. The number of significant places retained in the rounded off
value should be the same as that of the specified value in this standard.
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IS 1879 : 2010
Indian Standard
MALLEABLE CAST IRON PIPE FITTINGS —
SPECIFICATION
( Third Revision )
1 SCOPE IS No. Title
1.1 This standard covers requirements for following 1387 : 1993 General requirements for the supply
types of malleable cast iron pipe fittings threaded in of metallurgical materials (second
accordance with IS 554 for general purposes for the revision)
transmission of fluid and gas up to the limit of pressure 4759 : 1996 Hot dip zinc coatings as structural
and temperature specified in 1.3. These are indicated steel and other allied products
in following sections: (third revision)
4905 : 1968 Methods for random sampling
Section 1 General
8999 : 2003/ Pipe threads where pressure-tight
Section 2 Elbows, including twin elbows,
ISO 7-2 : 2000 joints are made on the threads —
union elbows and side outlet elbows
Verification by means of limit gauges
Section 3 Tees including pitcher tees and side
(first revision)
outlet tees
14329 : 1995 Malleable iron castings
Section 4 Crosses
Section 5 Bends including long sweep bends 3 TERMINOLOGY
and return bends
For the purpose of this standard the following
Section 6 Sockets
Section 7 Bushing and hexagon nipples definitions shall apply.
Section 8 Backnuts
3.1 Fittings — The connecting pieces connecting one
Section 9 Caps and plugs and
or more parts.
Section 10 Unions
3.1.1 Equal Fittings — Where all outlets are of the
1.2 Dimensions which are not included in the standard
same size.
are left to the discretion of the manufacturer depending
on the end use of the fittings. 3.1.2 Unequal Fittings — When two or more outlets
are of different size irrespective of the number of outlets.
1.3 These fittings shall be suitable for working pressure
of up to 1.4 MPa in the case of water and up to 0.7MPa 3.1.3 Male Fittings — Fittings having only male
in the case of steam, air, gas and oil at a temperature threads.
not exceeding 100°C.
3.1.4 Female Fittings — Fittings having female threads
2 REFERENCES on the outlet.
The standards listed below contain provisions which 3.1.5 Male-Female Fittings — Fittings having male and
through reference in this text, constitute provisions of female threads at the outlets.
this standard. At the time of publication, the editions
3.2 Size Designation — It denotes the size of threads
indicated were valid. All standards are subject to
revision and parties to agreements based on this of the threaded outlet of the pipe fitting and is
standard are encouraged to investigate the possibility determined by the nominal size (in inch) of threads as
of applying the most recent editions of the standards specified in IS 554.
indicated below:
NOTE — A relationship between nominal size (in inch) of the
thread at the outlet of the fitting and the corresponding nominal
IS No. Title
diameter DN, a numerical designation of size which is common
554 : 1999/ Pipe threads where pressure tight to all piping system other than the components designated by
ISO 7-1 : 1994 joints are made on the threads — outside diameter and corresponds approximately to the internal
diameter, in mm, is given in Annex A.
Dimensions, tolerances a nd
designation (fourth revision) 3.3 Reinforcement — An additional material at the
1
IS 1879 : 2010
outside diameter of an internally threaded fitting in the diagrammatic representation of the various types of
form of band or bead (see Fig. 1). fittings is given in Table 1.
3.4 Rib — Locally or axially aligned additional NOTE — It may be noted that the following terms are omitted
material on the outside or inside of a fitting for when reference is made to the type of fittings:
assistance in the assembly or manufacturing. a) Indication 90° for elbows, bends and tees of 90°,
b) Word ‘equal’ for equal fittings,
3.5 Outlet — Internally or externally threaded end of
c) Word ‘female’ for female fittings, and
fitting which connects with a pipe fitting or other d) Word ‘male’ for male fittings.
component, threaded in accordance with IS 554.
5.1.2 Size Designation
3.6 Run — Two principal axially aligned outlets of a
It is denoted by the nominal size (in inch) of the thread
tee or cross.
at the outlet of the fitting, threaded in accordance with
3.7 Branch — Side outlet(s) of a tee or cross. IS 554, Size designations for various types of fittings
are given in sections 2 to 10, as applicable.
3.8 Chamber — Removal of a conical portion at the
entrance of a thread to assist assembly and prevent 5.1.2.1 Equal fittings
damage to the start of the thread.
Where all outlets are of the same size, the fitting shall
3.9 Face-to-Face Dimension — Distance between two be referred to by that one size, irrespective of the
parallel faces of axially aligned outlet of a fitting. number of outlets.
3.10 Face-to-Centre Dimension — Distance from the 5.1.2.2 Unequal fittings
face of an outlet to the central axis of angularly
disposed outlet. They are referred to by the size of each outlet, the
sequence of specifying being dependent on the number
3.11 Centre-to-Centre Dimension — Distance between
of outlets as indicated in Fig. 2 and Fig. 3.
the two parallel central axis of the outlet of a fitting.
5.1.3 Right and Left Hand Thread
SECTION 1 GENERAL
For sockets and hexagon nipples with right and left-
4 SUPPLY OF MATERIAL hand thread, the letter R-L (right left) shall be added
after the nominal size of the fitting.
The general requirements relating to the supply of
material shall be as laid down in IS 1387. 5.1.4 Code Number
Code number for various types of fitting are given in
5 DESIGNATION
Table 1.
5.1 Malleable cast iron fittings shall be designated
Example for designation:
giving the following particulars in the sequence shown:
a) Type of fitting (see 4.1.1), a) Equal female elbow Size 1 = Elbow 1, A 1;
b) Size designation (see 4.1.2), b) Equal male or female bend 1 Size 1½ = Bend
1½ D4;
c) Right-and left-hand thread where applicable
(see 4.1.3), and c) Equal socket, threaded right- and left-hand
Size 2 = Socket 2 R-L, M2; and
d) Code number (see 4.1.4).
d) Reducing female tee, in which the sizes on
5.1.1 Type of Fittings
the run are 1 and ½ and the outlet is ¾ size =
It is denoted as elbow, bend, tee, cross, etc. The Tee 1 × ¾ × ½ B1.

FIG. 1 REINFORCEMENT OF FITTINGS
2
IS 1879 : 2010
FIG. 2 METHODS FOR SPECIFYING OUTLETS OF UNEQUAL FITTINGS HAVING TWO OUTLETS
FIG. 3 METHODS FOR SPECIFYING OUTLETS OF UNEQUAL FITTINGS HAVING MORE THAN TWO OUTLETS
6 MATERIAL 7.2 Wall thickness of fittings and tolerances on them
shall be as given in Table 2.
6.1 The material used for the manufacture of malleable
cast iron fittings shall conform to any of the grade 7.3 In case of reducing fittings, the dimensions at each
specified in IS 14329 as agreed to between the outlet shall be those appropriate to the nominal size of
manufacturer and the purchaser. that outlet.
6.2 Any other ferrous materials which give mechanical 7.4 Where maximum or minimum dimensions are not
properties at least equivalent to those grades of malleable
specified, the tolerances for centre-to-face, face-to-face
cast iron specified in 5.1 are allowed for fittings not larger
and centre-to-centre dimensions shall be as specified
than size 3/8 of the straight type, but excluding unions.
in Table 3.
7 DIMENSIONS AND DIMENSIONAL 7.5 Elbows, tees, crosses, sockets and caps may be
TOLERANCES
either plain or reinforced. Bends, pitcher, tees, twin
7.1 Dimensions of various types of fittings shall be as elbows and long sweep fittings shall be reinforced. The
specified in Tables 2 to 28 in Sections 2 to 10, as form of the reinforcement may be bend or bead and
applicable. shall conform to the minimum dimensions given in
col 5 and col 6 of Table 2.
NOTE — All the dimensions given in these sections enable
the fittings to be assembled with pipes threaded in accordance 7.6 The incorporation of a rib on any fitting is at the
with IS 554.
option of the manufacturer but the projection of the
7.1.1 Fittings of sizes and dimensions other than those rib shall not exceed the projection of the reinforcement.
specified in Sections 2 to 10 may be supplied subject
to agreement between the purchaser and the 7.7 Two typical forms of female ends are shown in
manufacturer provided all other requirements as Fig. 4. Either form may be used for code numbers D1,
stipulated in this specification are fulfilled. D4, E1, E2, G1, G1/45°, G4, G4/45° and K 1.
b

FIG. 4 FORMS OF FEMALE ENDS
3
IS 1879 : 2010
Table 1 Type of Fittings and Code Number
(Clauses 5.1.1 and 5.1.4)

4